High-field/high-frequency EPR of paramagnetic functional centers in Cu2+- and Fe3+-modified polycrystalline Pb[Zr(x)Ti(1-x)]O3 ferroelectrics

Rüdiger-A Eichel; Hrvoje Mestrić; Klaus-Peter Dinse; Andrew Ozarowski; Johan van Tol; Louis Claude Brunel; Hans Kungl; Michael J Hoffmann

doi:10.1002/mrc.1696

High-field/high-frequency EPR of paramagnetic functional centers in Cu2+- and Fe3+-modified polycrystalline Pb[Zr(x)Ti(1-x)]O3 ferroelectrics

Magn Reson Chem. 2005 Nov:43 Spec no.:S166-73. doi: 10.1002/mrc.1696.

Authors

Rüdiger-A Eichel¹, Hrvoje Mestrić, Klaus-Peter Dinse, Andrew Ozarowski, Johan van Tol, Louis Claude Brunel, Hans Kungl, Michael J Hoffmann

Affiliation

¹ Eduard-Zintl-Institute, Darmstadt University of Technology, D-64287 Darmstadt, Germany. eichel@chemie.tu-darmstadt.de

PMID: 16235219
DOI: 10.1002/mrc.1696

Abstract

Copper(II)- and iron(III)-modified Pb[Zr(x)Ti(1-x)]O3 ferroelectrics were investigated by means of high-field/high-frequency EPR. The results obtained suggest that Cu2+ and Fe3+ both substitute as acceptor centers for [Zr,Ti]4+. Whereas for the iron-doped system the charge compensating oxygen vacancies (V(O)**) lead to the formation of charged (Fe'(Ti-)V(O)**)* defect associates, no such associates have been observed for the copper-modified system. As regards the morphotropic phase boundary, the model of a mesoscopic mixing of the pure-member phases has been refined to a picture in which a nanoscale composition distribution prevails.